OBJECT OF THE INVENTION
[0001] The present invention relates to a procedure for the treatment of purines which allows
their complete elimination, and as a consequence, the sanitary problems, smells, etc.,
derived from their storage, obtaining as a final product a natural fertiliser appropriate
for cultivation or garden which can also be used as raw material for obtaining organominerals
or substrates.
BACKGROUND OF THE INVENTION
[0002] Currently, in countries that have a large population of pigs, there is the important
problem of treating the purines generated. This problems lies basically in the large
quantity of purines produced by each pig per day (approximately 10 litres) and in
the elevated toxicity that is produced by their application, with no prior treatment,
to the earth
[0003] This a major problem in the areas in which pig farms are found as, in order to maintain
their profitability, they have to concentrate as many pigs as possible on the farm,
pigs which produce such large quantities of purines per day that they are difficult
to eliminate.
[0004] A problem similar to that of pig purine also occurs for poultry purines and those
of cows, and so hereinafter, we will refer to purines in generic form, these can be
of the pig, cow or poultry variety as the procedure that is proposed is applicable
to all these types.
[0005] To solve the problem described above there are several procedures or machines that
carry out the treatment of the aforementioned purines. In this sense the Spanish patents
nos. 8201937, 8801909, as well as European patent no. 0445102, the German patent no
3246526, the French patents nos. 2673070 and 2260550, as well as the US patent no.
4193786 can be cited. All of these make reference to procedures, installations or
machinery at a farm level and never to installations or procedures for industrial
application. On the other hand, these installations or procedures, in their majority,
simply eliminate or transform the toxic or poisonous components present in the purines,
obtaining as a final product, in the best of cases, something which is not toxic but
which has little use as a fertiliser.
[0006] The applicant himself, in the Spanish patent no. 9102526, describes a system for
the elimination and recycling of residues for the manufacture of organic fertiliser,
based on mixing purines with an absorbent product such as sawdust, straw, peat, or
animal excrement, using for the treatment an installation with two homogenisation
vats connected via to fermentation belts, all in combination with a tipping skip along
them to crush and tip the biomass obtained. In this invention an installation of industrial
nature is described, but does not have very high productivity levels, needing at least
30 days to obtain the final product which might be a fertiliser or in many cases simply
an organic product.
[0007] This being the case, we can say that, currently, there is no known procedure or industrial
installation with sufficiently good performance that it allows the systematic collection
of the purines generated in a geographic zone with a high pig, cow or poultry density
and that carries out a subsequent treatment and that eliminate completely the purines,
obtaining as a result a completely harmless product that can then be used as a fertiliser.
DESCRIPTION OF THE INVENTION
[0008] The present invention completely resolves the previously described problems, by means
of a purine elimination process that allows their systematic collection from an extensive
geographic zone, obtaining, after their treatment, a product free of toxic components
and which also shows characteristics of natural fertiliser which can be sold or used
directly, to condition ground, to cover recently sowed plants in the garden, etc.
The natural fertiliser obtained can also be used as a raw material in other processes.
For example, if mineral elements are added (NPK) an organomineral is obtained of the
desired characteristics and if peat or silicon sand is added a substrate is obtained
which can be used in nurseries and in the garden.
[0009] More exactly, the procedure of the invention consists in mixing the purines to be
treated with cow dung, chicken droppings and a vegetal absorbing agent such as sawdust
or straw and their subsequent treatment in two phases. The first phase is a mixing
phase and homogenisation phase and the second phase is one of turning over and moving
and gradual transport, during which the fermentation takes place.
[0010] In this procedure the addition of excrement is not carried out optionally as an purine
humidity absorbing element, but rather their addition is in large quantities, acting
as an oxidant at the same time as being organic material which contributes fertilising
properties to the product obtained. After many laboratory trials, it has been possible
to determine the quantities needed of each of the raw materials to contain a final
product completely free of pathological germs which can be described as a natural
fertiliser whose specific characteristics will be described later.
[0011] The procedure of the invention starts with the arrival and storage of the raw materials,
placing the purines in vats with permanent stirring, while the sawdust and the excrement
are stored directly in piles open to the air with lixiviate Control.
[0012] The treatment of the purines starts by mixing the purines, excrement and sawdust
in a homogenisation vessel, equipped for stirring, at a proportion of 30 to 60 % purines,
10 to 30 % cow dung, 5 to 10 % chicken droppings and 15 to 40 % sawdust. The percentage
for chicken droppings can be substituted by cow dung. In the homogenisation vessel,
the mixture is also seeded with some bacterial strains. The percentages of each raw
material used can vary within the ranges mentioned above, depending on the humidity
level of the raw materials. This is because the fertilising power is only found in
the solid material and not in the water, and we should, therefore, adjust the quantities
needed for each in order to arrive at a natural fertiliser with the desired characteristics.
[0013] Next, the biomass or mixture obtained in the homogenisation vessel is tipped onto
the base in piles that aid the fermentation of this biomass. The homogenisation vessel
can be moved on rails on a platform parallel to the milling unit allowing the contents
of the vessel to be tipped in several longitudinal rows or lanes.
[0014] These piles of biomass should have enough consistency to avoid a self-flattening
of the deposited biomass thus helping the fermentation of their inner regions. The
optimal dimensions of these piles are such that the biomass forms a trapezium with
a longest side of 3.5 - 4.5 m, a width of 2 - 3 m and a height of between 1.5 and
2.5 m. The height can vary as a function of the humidity, with a greater height corresponding
to a more humid biomass.
[0015] To reduce the fermentation time needed to produce the three phases of biomass maturity,
mesophile, thermophile, and stabilisation, the use of a tipping skip has been anticipated
which moves around the piled material from the different rows or lanes daily, thus
attaining an optimal aeration of the product. This is so because 24 hours are needed
in order that, after each movement of the biomass, its internal temperature spontaneously
increases once again, thus continuing the aerobic fermentation.
[0016] The tipping skip is operated by a sliding crane that can be moved longitudinally
and transversally around the base to agitate the piled product from each one of the
rows or lanes. The tipping takes place from the furthestmost point of the base towards
the discharge zone, displacing the product towards the furthermost extreme of the
files, in such a way that after 11 days of aerobic fermentation the product moves
from the discharge to a point at the edge of the base where it can easily be collected,
to be ground up, granulated, made into pellets, put into sacks and stored in a silo.
[0017] And so, by piling the product up in the aforementioned rows or lanes and by daily
tipping an aerobic fermentation is achieved in only 11 days, while with the current
systems the composting time is approximately 5 to 6 months.
[0018] After 11 days of maturation of the product in the piles, a natural fertiliser is
obtained, which has a high microbial lifetime and which continues to ferment, therefore
raising the teamperature and the C/N ratio which should be reduced if the product
is to used as a fertiliser. To do so, the product is now stabilised, and it is transferred
to some maturation beds where it is spread out, until the fermentation is complete.
[0019] The proposed procedure allows the final production of a natural fertiliser with the
following characteristics:
2 units of N2 fertiliser, 2 units of P2O5 fertiliser and 2 units of K2O fertiliser (total of 6 fertiliser units).
- Humidity of 30-35% (preferably 34%)
- 80-85% organic material
- pH = 7.5-8.5
- C/N ratio = 14 (always less than 20).
DESCRIPTION OF THE DRAWINGS
[0020] To complete the description which is being made and with the aim of helping understand
the characteristics of the invention, the present descriptive memorandum is accompanied,
as an integral part thereof, by a single sheet of drawings, in which in an illustrative
and non-limiting way, a plan has been drawn up for setting up an installation, object
of the invention, for the elimination of purines.
PREFERABLE EMBODIMENT OF THE INVENTION
[0021] As can be seen in the figure, the installation comprises in the first instance a
series of vats or silos (1) for storage of purines, as well as a series of hoppers
(2) in which the storage and administration of the products to be mixed with the purines
is carried out. These are, cow dung and chicken droppings and vegetal absorbing agents
such as sawdust. All the administration hoppers (2) have in common an input belt (3),
which transport these products to the homogenisation vat (4), equipped with a stirring
device. This stirring can be carried out be means independent to the vat such as stirrers,
or by the vat itself, which could be rotated, thus producing the required stirring.
This homogenisation vat (4) is mounted in such a way that it can be moved along rails
(5) on a transversal platform (6) with respect to a concrete base (7), onto which
the mixture or biomass obtained is discharged in the form of piles which will form
rows or lanes (9) longitudinal to the base (7). Also anticipated is a transversal
crane (11) which can move a tipping skip which breaks up and tips the biomass along
the different rows or lanes (9). Logically, the entire installation will be covered
(7) to prevent exposure of the piles of biomass to the rain which would prolong the
dehydration step.
[0022] Each pile of biomass, corresponding to a homogenisation vat load (4), will have the
form of a trapezium with a longest side between 3.5 and 4.5 m, a width of between
2 and 3 m and a height of between 1.5 and 2.5 m. The height can vary depending on
the humidity, with a larger height corresponding to a more humid biomass. The different
vat loads or biomass piles will be deployed in rows or cells on the base.
[0023] The number of files, their length and the speed of the tipping skip, are such that
all the biomass can be tipped daily. The speed at which the tipping is carried out
can be varied if there is a change in the volume of biomass (number of rows used)
or the number of working hours anticipated for the installation.
[0024] And so, the vat (4) will deposit the homogenised mixture or biomass in each of the
files or lanes (9), the biomass being progressively displaced towards the opposite
extreme of the discharge with the help of movers equipped with a sliding crane (11),
in such a way that the time taken to cover the base (7) is equivalent to the fermentation
time or the conversion of the biomass into the required natural fertiliser.
[0025] In accordance with the described installation, the purines are stored in the tanks
(1) equipped with permanent stirring, while the sawdust, cow dung and chicken droppings
are stored in administration hoppers (2), effecting a pumping of the purines towards
the vat (4) and, a transportation means, by a corresponding belt (3), for the rest
of the raw materials to the homogenisation vat (4), which is seeded in due time with
a bacterium previously cultivated in the laboratory.
[0026] After many studies and laboratory trials the quantities necessary for each of the
integral raw materials have been determined. They are as follows:
30 to 60% of purines
- 10 to 30% of cow dung
- 5 to 10% of chicken droppings
- 15 to 40% sawdust
[0027] Depending on the availability of the dungs in the geographical zone corresponding
to the installation, cow dung or chicken droppings can be substituted by horse manure
or bird droppings. If no type of bird droppings are available cow dung will be used
alone, increasing their proportion in the mixture.
[0028] Once the mixture has been homogenised in the vat (4) the product is discharged in
piles which form rows or lanes (9) parallel to the base (7).
[0029] Then, using a tipping skip, moved by a sliding crane (11), the product is turned
upside down daily, in the rows or lanes (9) to prevent the formation of nuclei of
anaerobic fermentation, where each inversion brings the pile nearer to the opposite
end of the base (7) so that after a period of about 11 days it reaches the unloading
belts (13) (13') or grinding and granulating apparatus. During these 11 days, the
mesophile and thermophile phases have occurred, and the stabilisation phase is starting,
which will be completed in the maturation beds.
[0030] With the proposed procedure and in the installation described a natural fertiliser
is finally obtained with the following characteristics:
2 fertilising units of N2, 2 fertilising units of P2O5 and 2 fertilising units of K2O (total of 6 fertilising units)
- Humidity of 30-35% (preferably 34%)
- 80-85% organic material
- pH = 7.5-8.5
- Ratio C/N = 14 (always less than 20)
[0031] Optionally, the installation can be completed with a complimentary bay (12), where
the product obtained is taken, after the 11 days of fermentation, for its preparation
before selling it and using it. And so, the product obtained goes from the base (7)
to the complimentary bay (12), by conveyor belts (13) and (13'), followed by a common
belt (14) which takes the product to the mixer (15). Here two independent lines are
established (16) and (17), the second of which provides access, via belt (18) to a
grinder (19) where the product is ground to a dust. At the beginning of belt (18)
there is an unloading hopper (20). Between the mixer (15) and the belt (18), there
is a second mixer (21), which has a shoot coming out of it (22), by which the product
can get to the hopper (23) and pass through a granulating machine (24). There is a
cyclone cooler (25) associated with the corresponding aspirator (26).
[0032] The product is taken via a belt (27) from the granulating machine (24), and sent
to the output (28), where there is a rotating sieve (29) from which the granulated
product goes to a lifter (30) which takes the product in the form of grains to the
collection and storage silos (31).
[0033] As for the powdered product obtained from the grinder (19), this can be sent by a
belt or shoot (32) to the lifter (33) and, from here to the aforementioned silos (31).
[0034] The product obtained after the process described can be used directly as a fertiliser,
as a ground conditioner, as a cover for newly sown plants in the garden or even for
animals. It can also be used as raw material in other processes and also for example
mineral elements (NPK) can be added to give an organomineral of the desired characteristics.
If peat or silicon sand is added a substrate is obtained for use in nurseries or in
the garden.
[0035] It is not considered necessary to make this description more detailed so that an
expert in the matter understands the reach of the invention and the advantages that
are derived from it.
[0036] The materials, their form, size and deployment of the elements will be susceptible
to variation provided that this does not constitute a change to the essence of the
invention.
[0037] The terms in which this memorandum has been written should always be taken in their
broadest sense and are not limiting.
1. Process for the complete elimination of purines, essentially characterised because
it consists of mixing purines with cow dung, chicken droppings and sawdust or equivalent
vegetal absorbent material, in the proportions 10-30% cow dung, 5-10% chicken droppings,
30-60% purines and 15-40% sawdust, where the percentage of chicken droppings can be
substituted completely by the cow dung, homogenising the mixture in a vat which is
seeded with a bacterium, which once homogenised is deposited, forming biomass piles,
on a base where it remains for 10 to 12 days, during which it is moved, turned over
and aired once a day and at the same time moved towards the edge for removal, all
this in such a way that during the time the biomass takes to reach the edge the fermentation
and conversion of the initial raw materials into natural fertiliser is complete, with
high microbial life, which can be put on beds until maturation is complete, or they
can be taken to a parallel installation to be ground, dried, granulated and/or pelletised.
2. Installation to put into practice the process of claim 1, characterised in that it
includes a homogenisation vat (4), equipped with a means for stirring, into which
the purines from the silo or storage containers are introduced (1) and the cow dung,
chicken droppings and sawdust from the administration hoppers (2), the said vat (4)
being mounted is such a way that it can be moved along rails (5) on a platform (6)
transverse to the base (7) in such a way that the homogenisation vat (4) can deposit
the biomass on the base forming piles, making a movement and turning the deposited
biomass, with the collaboration of mover equipment which move longitudinally along
the base, in such a way that biomass moves towards the area of collection, forming
longitudinal rows or lanes, with the journey and turning-over timed so that the biomass
reaches the edge for collection after 10-12 days.
3. Installation, according to claim 2, characterised essentially in that the piles of
product or biomass formed from the mixture produced in the vat form approximately
a trapezium whose longest side is 3-5 - 4.5 m and 2 - 3 m wide and a height of between
1.5 and 2.5 m.
4. Natural fertiliser obtained by means of the procedure of claim 1, by mixing, homogenising
and fermenting the purines, cow dung, chicken droppings and sawdust, to give a completely
harmless product, with at least six fertiliser units distributed, according to the
raw materials between N2, P2O5 and K2O, a humidity of 30-35%, a percentage of organic material of 80-85%, a pH = 7.5-8.5
and a ratio C/N = 14.